This thread is slowly starting to turn into one of those many other threads where people argue and try to convince the others that body X is better than body Y mostly based on what they use it for.
Why can't we just let go and stop fighting. Different photographers look for different things in a camera. That's why the way we interpret DxO scores, especially the various individual measurements, matters more than the overall score.
For serious landscape photographers like Hogloff, the A7R, or a Nikon D810 is a much better fit. They need DR at low ISO, along with high MP. They don't care that at higher ISOs there is no difference in DR (some Canon bodies e.g. 6D may even pull ahead slightly). They have all the right to defend their choice of camera for their own use. No argument there. And that's when DxO scores are useful. They know exactly what they're looking for, look up the relevant measurements, and it helps them make a decision.
Now, that doesn't mean that I'd go out and shoot a low-light fast paced wedding reception with his A7R. My needs and priorities are completely different from his. I look up DxO, see low ISO DR and I'm not concerned about it, I don't really care. What I do care about is that my 5D3 is better suited for what I use it for than an A7R; AF, lenses, ergonomics for my hand, all make up a better system while providing a very good performance at higher ISOs where I usually shoot at, so DR at low ISOs does not concern me.
So basically, just like it has been mentioned in this thread, you need to be able to read between the lines, and analyze the measurements that's relevant to your needs. So in that sense DxO is useful.
However, I do have problem with the final overall score, or I should say how it is interpreted in the internet, especially by those who don't know what it means and how it is calculated.
Just like the car analogy, you can't really give purchasing advice to someone based on the overall DxO score, especially if you don't know what the potential purchaser shoots or wants in a camera. Same with cars. How do you recommend a car based on one overall score to someone when you don't even know what he/she is looking for in a car? Soccer mom? Single guy? An outdoorsy couple who likes to camp? All different needs, one overall score for each car in a car comparison test is not going to help them much, they need details.